Author/Authors :
Sobhanardakani، Soheil نويسنده Department of the Environment, Hamedan Branch, Islamic Azad University, Hamedan , , Zandipak ، Raziyeh نويسنده MSc Environment, Young Researchers & Elite Club, Hamedan Branch, Islamic Azad University, Hamedan, Iran. , , Javanshir Khoei ، Arash نويسنده Department of Fisheries, University of Tehran, Karaj, Iran. , , Hosseini، Seyed Mehdi نويسنده Department of the Environment, School of Natural Resources and Marine Sciences, Tarbiat Modares University, Noor, Iran , , Moslemi ، Mehran نويسنده Department of Fisheries, Islamic Azad University, Jouybar Branch, Jouybar, Iran. , , Delfieh ، Parisa نويسنده Department of Fisheries, Khoramshar University of Marine Science and Technology, Khoramshar, Iran. ,
Abstract :
Background and purpose: The discharge of toxic heavy metal ions into the environment is a
serious pollution problem. Heavy metal ions pose adverse toxic risks to human health at very low
concentrations. The aim of this paper is the adsorption potential of chitosan (CS) in the removal
of Hg(II) and Cd(II) ions from aqueous solution.
Materials and Methods: This study was conducted in laboratory scale. In this research, CS was
used as an adsorbent for the removal of Hg(II) and Cd(II) from aqueous solutions. In batch tests,
the effects of various parameters such as metals concentration (40-350 mg/L), pH solution (2-8),
contact time (5-120 min), and adsorbent dose (0.25-2 g) were investigated.
Results: The results showed that adsorption of Hg(II) and Cd(II) ions on CS strongly depends on
pH. The experimental data were analyzed using the Langmuir and Freundlich isotherm models.
Equilibrium data fitted well with the Langmuir model and the maximum adsorption capacity of
the CS for Hg(II) and Cd(II) were 52.63 and 58.8 mg/g, respectively. Kinetic analysis showed
that adsorption was most accurately represented by a pseudo-second-order model.
Conclusion: The obtained results showed that CS is a readily, available, economic adsorbent and
was found suitable for removing Hg(II) and Cd(II) ions from aqueous solution.
